High temperature magnetic single shot instruments are used to measure the well track in petroleum drilling technology, which has capability of recording the inclination, azimuth of well and the face angle of high-side tool used for elbow on the film by means of optical imaging. It employs with special heat resistant sleeve. When working, the small diameter instruments will be firstly inserted in a special heat resistant sleeve, it will be placed in protection cartridge together with heat resistant sleeve and it can ensure the measurement in ambient temperature up to 250deg C to be carried out normally in a certain period, which is applicable for measuring in deeper well and higher temperature down well. Either throwing measuring mode or suspending measuring mode is available.